Effect of Si content on fatigue fracture behavior of hot-rolled high-silicon steels

6th International Conference on Fracture Fatigue and Wear

Umezawa, Osamu^1 ; Kanda, Jyunichi^2 ; Yamazaki, Takao^2

Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama

240-8501, Japan^1

Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama

240-8501, Japan^2

关键词: Fatigue fracture behavior;    Fatigue strength;    High-silicon steel;    Lattice rotations;    Misorientation distributions;    Strain incompatibility;    Ultimate tensile strength;    Work hardening rate;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/843/1/012046/pdf
DOI  :  10.1088/1742-6596/843/1/012046

来源: IOP

【 摘 要 】

As the Si content was increased from 1.5 to 5 mass%, both the yield stress and ultimate tensile strength were increased, respectively. The work hardening rate was also increased as the increase of Si content. On the contrary, the elongation was decreased as the increase of Si content, and the fracture manner was shifted from ductile to brittle. The 107cycles fatigue strength was higher as the increase of Si content. The small misorientation distribution as ladder-like was detected in the grains of 1.5 mass%Si steel. Around the grain boundary, the strain incompatibility was detected in the steels containing over 3 mass%Si. The lattice rotation was locally detected in the vicinity of grain boundaries.